If you read my posts, they are about makign a compromise to not make Legionaires suck unrealistically and considering that the AI has a pretty bad habit of frontal charges, you're probably going to run into that problem if you actually get to Marian, haven't conquered the world, and Parthia has taken over everything in the East.

If you're going to balance for singleplayer, you should take Phalanx out completely because the AI cannot handle it at all. :-p Lets just make units balance realistically and leave it at that.